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United States Patent | 6,008,633 |
Schettler | December 28, 1999 |
A high-power grid-compatible converter-controlled, voltage-injecting phase-shifting transformer, includes a converter, an energizer transformer connected the converter, and a booster transformer which has at least one phase connected to the converter. The converter has an excitation-side power converter with at least one phase intercoupled by a DC intermediate circuit to an output-side power converter with at least one phase. Each of the excitation-side power converter and the output-side power converter have turnoff power semiconductors. Each phase of the excitation-side power converter has n double cascades electrically connected in series. Each of the double cascades have a capacitive energy store with a terminal and two switching devices which include the turnoff power semiconductors connected electrically in parallel with the capacitive energy store. Each phase of the output-side power converter has n four-quadrant controllers with AC voltage terminals and DC voltage terminals. The booster transformer has n two-winding transformers per phase, a secondary side and a primary side. The n two-winding transformers are connected electrically in series on the secondary side and coupled in each case on the primary side to the AC voltage terminals of the four-quadrant controllers. The DC voltage terminals of each of the four-quadrant controllers are connected to the terminal of the capacitive energy store of a corresponding one of the double cascades.
Inventors: | Schettler; Frank (Erlangen, DE) |
Assignee: | Siemens Aktiengesellschaft (Munich, DE) |
Appl. No.: | 050659 |
Filed: | March 30, 1998 |
Sep 29, 1995[DE] | 195 36 468 |
Current U.S. Class: | 323/361 |
Intern'l Class: | H01F 030/12 |
Field of Search: | 323/356,361 363/39,40,95,96,135 |
4663702 | May., 1987 | Tanaka | 363/65. |
4870557 | Sep., 1989 | Stacey | 363/43. |
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5587892 | Dec., 1996 | Barrett | 363/44. |
5673189 | Sep., 1997 | Schettler. | |
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42 25 269 A1 | Feb., 1994 | DE. | |
43 23 290 A1 | Jan., 1995 | DE. | |
43 43 929 A1 | Jun., 1995 | DE. | |
2 293 928 | Apr., 1996 | GB. |
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